Short
Talk
Abstract:Galaxy
clusters are the largest gravitationally bound objects in the Universe
and provide crucial insight to the standard model of Cosmology.
Their abundance as a function of mass and redshift is highly sensitive
to cosmological parameters such as the amplitude of matter fluctuations
and the dark energy equation of state.
Though galaxy clusters are powerful probes of cosmology, they are
currently limited by a ~15% mass uncertainty. Future optical (LSST) and
X-ray (eROSITA) surveys will provide even larger samples of galaxy
clusters; our ability to fully realise the potential of these
samples depends on better mass estimates. Gravitational lensing is
widely considered as the gold standard in mass estimation.
In this talk I will present a method to extract the lensing signal from
the Cosmic Microwave Background (CMB) data. With this method we predict
mass uncertainties will be improved to 3-6% for upcoming CMB
experiments (SPT-3G, AdvACT etc) to less than 1% for next stage CMB
experiment (CMB-S4).
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